Which of these is a solution to the Fermat-Pell equation x2−6y2=1x^2 - 6y^2 = 1x2−6y2=1?
(3,1)(3, 1)(3,1)
(5,2)(5, 2)(5,2)
(25,10)(25, 10)(25,10)
(49,20)(49, 20)(49,20)